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Cell Division Mitosis And Meiosis Biology Essay

Eduard Adolf Strasburger (PL-DE) accurately described the processes of mitotic cell division and demonstrated that cells are formed directly from previously existing cells (, ).

An example of a multicelluar organism using mitosis for cell replacement is in the human body, the human body have about twenty-five million mitotic cell divisions occur every second to replace the cells that have finished their .

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Wilhelm Friedrich Benedikt Hofmeister (DE) used and other species of plants to provide the first accurate descriptions of all stages of mitosis. He was able to describe the loss of the nuclear membrane prior to cell division. He also presented evidence of cell division leading to the formation of tetrads within pollen (meiosis) but did not grasp its significance ().

David Paul Hansemann (DE) described in detail the mitotic figures of 13 different carcinoma samples. In every case, he found examples of aberrant mitotic figures. These included multipolar mitoses and anaphase figures that showed asymmetric distribution of 'chromatin loops' (or chromosomes). He postulated that these aberrant cell divisions were responsible for the decreased or increased chromatin content found in cancer cells (). This is called the development.

Mitosis and Meiosis - Cell division may ..

Hugo von Mohl (DE), for the first time, carefully described some details of mitosis in plants including the appearance of the cell plate between daughter cells. He remarked, "Cell division is everywhere easily and plainly seen in Confervae, Mycelia, Chara and also in terminal buds and root tips of Phanerogams." He described and drew quadripartition by furrowing in the pollen-mother-cells of ().

For reproduction to occur cell division is necessary and this can be divided into two categories according to the behaviour of the chromosomes, they are known as mitosis and meiosis.

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Mitosis Write-Up - Essay Samples

Both the process of mitosis and meiosis involve the duplication of the DNA and the splitting of the nucleus.Mitosis is a type of cell division that produces two genteically identical cells from a single cell.

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Walther Flemming (DE) provided the first cytological evidence that the cell divisions involved in the production of sperm differed from the normal type of mitosis. Spermatogenesis, he reported, involved two types of cell division. The first type differed little from normal mitosis, but the second, or , seemed to be unique in two ways. First, the chromosomes appeared as knots or rings. Second, and more significantly, the number of such ringed chromosomes was half the number that appeared in tissue cells, twelve rather than twenty-four in the salamander ().